/
from_spec.go
116 lines (104 loc) · 2.35 KB
/
from_spec.go
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package main
import (
"bytes"
"errors"
"fmt"
"strings"
)
type FromSpec struct {
nameAddr *NameAddr
addrSpec *AddrSpec
params []KeyValue
}
func ParseFromSpec(s string) (*FromSpec, error) {
r := &FromSpec{nameAddr: nil,
addrSpec: nil,
params: make([]KeyValue, 0)}
laquot_pos := strings.Index(s, "<")
raquot_pos := -1
if laquot_pos != -1 {
raquot_pos = strings.Index(s, ">")
if raquot_pos == -1 || raquot_pos < laquot_pos {
return nil, fmt.Errorf("Malformatted header From: %s", s)
}
}
params := ""
var err error = nil
if raquot_pos != -1 {
r.nameAddr, err = ParseNameAddr(s[0 : raquot_pos+1])
if err != nil {
return nil, err
}
pos := strings.IndexByte(s[raquot_pos+1:], ';')
if pos != -1 {
params = s[raquot_pos+1+pos+1:]
}
} else {
pos := strings.IndexByte(s, ';')
if pos == -1 {
r.addrSpec, err = ParseAddrSpec(s)
if err != nil {
return nil, err
}
} else {
r.addrSpec, err = ParseAddrSpec(s[0 : pos+1])
if err != nil {
return nil, err
}
params = s[pos+1:]
}
}
if len(params) == 0 {
return r, nil
}
for _, value := range strings.Split(params, ";") {
kv, err := ParseGenericParam(value)
if err != nil {
return nil, err
}
r.params = append(r.params, kv)
}
return r, nil
}
func (fs *FromSpec) GetAddrSpec() (*AddrSpec, error) {
if fs.nameAddr != nil {
return fs.nameAddr.Addr, nil
} else if fs.addrSpec != nil {
return fs.addrSpec, nil
}
return nil, errors.New("No nameSpec and addrSpec")
}
func (fs *FromSpec) String() string {
buf := bytes.NewBuffer(make([]byte, 0))
if fs.nameAddr != nil {
fmt.Fprintf(buf, "%s", fs.nameAddr.String())
} else if fs.addrSpec != nil {
fmt.Fprintf(buf, "%s", fs.addrSpec.String())
}
for _, param := range fs.params {
fmt.Fprintf(buf, ";%s", param.String())
}
return buf.String()
}
func (fs *FromSpec) GetParam(name string) (string, error) {
for _, param := range fs.params {
if param.Key == name {
return param.Value, nil
}
}
return "", fmt.Errorf("No such param %s", name)
}
func (fs *FromSpec) GetTag() (string, error) {
return fs.GetParam("tag")
}
func (fs *FromSpec) SetTag(tag string) {
for _, param := range fs.params {
if param.Key == "tag" {
param.Value = tag
return
}
}
params := make([]KeyValue, 0)
params = append(params, KeyValue{Key: "tag", Value: tag})
fs.params = append(params, fs.params...)
}